It is a high-quality laboratory screw cap designed for safe and precise fluid handling. Made from chemically resistant PPS, it features a freely movable PTFE insert and two UNF 1/4" female threads for connecting capillary tubing with an outer diameter of 3.2 mm. Each connection is equipped with an integrated stopcock, allowing for individual flow control. The cap also includes a b.safe air valve with a service life indicator for safe venting and pressure equalization. Additionally, it features an extra capillary connector on the bottom side of the lid, enhancing system flexibility.